Not complete protection, but it does HELP to LIMIT the amount of particles that you're spewing in the air. So that does something in helping the curve come down.
Size of corona virus still less than the pores of masks we are using so definitely it is going to do more hamr than good because wearing mask increases the chance of virus to live in the mask itself so later it will get into any of the holes we have in our body and people keep using the same mask all the time which is definitely lead us to be infected.
Well, if that's the case (using the same mask repeatedly), then there's really a chance that they'll get the virus.
Here in our country, we're told to wear mask every time that we're going out of our home. But upon returning, it is necessary to dispose the mask immediately (if it's a disposable one) and if it's washable, then separate it from other things and wash it as soon as possible.